So we have a publisher and 2 subscriber running CUCM 11.5. All of my 7965 in other buildings works fine except this one particular building. The weird thing is some of the phone work fines but after it loses power it doesn't work anymore. I notice it's not pulling the correct load from TFTP either which is SCCP45.9-4-2SR3-1S. If I take the phone from this building and bring it to my building it boots up just fine. Our network team said its not network because they can ping and see the MAC on the switch.
The phones in this building are configured the same way as other building using voice vlan from what I was told by our network team.
Any help would be greatly appreciated as we have been tackling this issue for weeks!
The weird thing is some of the phone work fines but after it loses power it doesn't work anymore.
Is the phone getting the correct IP address?
If yes, what happens if you put the IP address into a browser?
+ What do you see on the phone screen when they are not registered?
+ Are you able to check the phone status messages on the phone ? Do you see any error in those messages like 'Timeout' etc.
The status message says DNS Timeout.
DNS timeout? What is the value assigned to DHCP Option 150? Is it in the form of an IP address?
Are CUCM nodes represented by host names instead of IP address? You can cross check that in System-->Server list on the CUCM.
If that is the case, phones will need DNS server to resolve those in order to register.Make sure the DNS server provided by the DHCP server to phones can resolve those Host name/FQDN.